Yeah, the BOV might have been fully open when I tried disconnecting it. It wasn't until later did I realize that the fine print on the Greddy paperwork on the other side which wasn't written in Japanese said the BOV comes from the factory on the softest setting. But now, with the BOV adjusted a bit stiffer, I'll try disconnecting it again and see if it makes a difference.
As far as the lean issue... I know and understand the truck will go lean when you shut the throttle. Jeff was also checking that I knew that as well.
The lean issue exhibits itself in two ways. I may back off the gas, but I'm not fully off the gas. Consider a coast with light throttle. Maybe I'm merging on the freeway and after a little romp I back off a bit to go with the flow of traffic. Maybe I pass a school and ease off the throttle to slow down but keep going. A/F shows rich initially then goes lean under throttle. Engine stumbles under the 17:1 a/f. That's one of the moments I'll see the maf counts hang when rpm and load are lower. Now getting back into the throttle after this, the truck stays lean at 17-18:1. After a few seconds of sputtering, then i get full rich 10:1. If it doesn't die there, then I'm usually surprised.
The second lean condition is stepping on the gas from a stop. At idle I'd see the normal 14.8-15.1:1 a/f. Stepping into the gas, when fully warm, the a/f will go lean on me again to 17:1 and then cause the truck to run bad. More gas and richer but back off again and I get the condition I mentioned previous to this one.
Both conditions mainly show themselves when the truck is really warm. At that time, the truck is usually much more fun to drive because the turbo is spooling up, I'm hitting boost quickly, and then when trying to return to some level of sanity is when it wants to die.
So, if you think what I thought, the first thing I say was well, that lean condition from a stop must mean your maf transfer is jacked. So I've been datalogging the hell out of it. In neutral, noting a/f and short term fuel trim counts and making sure the numbers are right. OK. Still does it. So what do I do? I decide why not richen it up and make it fat with an open loop tune. But that didn't work out as I thought it would as low throttle besides idle was horrible.
The dashpot settings made this much better in addition to increasing the range of learning the computer can do. If I can keep it from doing the lean issue it might actually be a streetable ride. I should check my TPS voltage.